Hi mate,
I will give you full marks for perseverance on getting the engine out! I have done that job many times on in-service RL's, we had a cradle that sat on a large trolley jack, and once clear you could lower it making it more stable to move around. If you are going to put it back the same way, I would use solid wheels and get a sheet of strong ply, or some old steel plate so you can move it under the lorry easier.
Your mention of sump being dented, I think you have the wrong sump for a 4x4, it should have a deep well at the front. This is why they fitted sump guards in front.
regards, Richard